Born in 1963
Software author and amateur jazz musician,
Engineer and nerd,
Part time rautavist in Frankfurt, Germany
Internet Projects
AstroViewer Sky Map 
AstroViewer is an interactive sky map that helps you to find your way in the night sky quickly and easily.
AstroViewer ISS
The positions of the International Space Station ISS and the Chinese Space Station Tiangong and their ground tracks in real time.
ISS and Tiangong sighting opportunities for any location.
AstroViewer Widgets
HTML code to embed a night sky map, the current position of the ISS or other AstroViewer Widgets in your website.
The Low Gs
Ukulele Bass Vocals
Jazz
We founded The Low Gs, a ukulele jazz band, in 2018.
Ukulele Voicings
Here you find all voicings (that is where you place your fingers on the fretboard) for a given chord. And you find all chords made up by a specific voicing on your ukulele.
Pico Projects
Tiny projects, more or less rautavistic...
Average Birthday
Above average by averaging
Distance and Direction
What is how far in which direction?
Prime Summands
Prime factors was yesterday...
Circuit Board Puzzle
Design your own hardware
Fair Meeting Point
Fairness by equidistance
Mileage Hunter
Collect flight miles
Signpost Quiz
What's the location of this signpost?
Ananyms
Clever stage names
Digital Watches
... excitingly hard to read
Golqroc
Game of Life QR-Code Challenge
Colorful Matter
"Game of Life" in color
Decimal Time
All in on the ten
Roman Calculator
Do as the Ancient Romans did
Redundancy
Deflate your texts
Text-o-mat
It writes and writes...
Comment Viewer
The hidden world of HTML comments
FlatGPT
My answer to ChatGPT
QRlify
Photos as QR-Codes